/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { isInterface } from "@idlizer/core"
import { IDLFile } from "../../utils/idl"

export class MultipleDeclarationFilterTransformer {
    constructor(
        private file: IDLFile
    ) {}

    transformed(): IDLFile {
        const seen = new Set<string>()
        return new IDLFile(
            this.file.entries.filter(it => {
                if (!isInterface(it)) {
                    return true
                }
                if (seen.has(it.name)) {
                    return false
                }
                seen.add(it.name)
                return true
            })
        )
    }
}
